<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>task01</title>
    <link rel="stylesheet" href="task01.css">
    
</head>
<body>
    <div class="warp">
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
    
    <div class="btn">
        <button class="start" id="btn1">开始闪</button>
    <button class="end" id="btn2">结束闪</button>
    </div>
</body>
<script src="task01.js"></script>
</html>

